PROCESS FOR PREPARING L-POLYLACTIC ACID BY MICROWAVE-ASSISTED SYNTHESIS

摘要

The invention relates to a process for the synthesis of highly pure L-polylactic acid. According to the invention, the process comprises the solvent free melt-polycondensation of the L enantiomer of the lactic acid at the temperature of 100...130°C, a pressure of 60...80 bar and an irradiation power of 800...1000 W, for 10...30 min, followed by isolating the polylactic acid by dissolving it into dichloromethane and precipitating it with water.